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| <div class="subTitle">org.apache.hadoop.mapred.lib.aggregate</div> |
| <h2 title="Class ValueAggregatorJob" class="title">Class ValueAggregatorJob</h2> |
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| <li>org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorJob</li> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class <span class="typeNameLabel">ValueAggregatorJob</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">This is the main class for creating a map/reduce job using Aggregate |
| framework. The Aggregate is a specialization of map/reduce framework, |
| specilizing for performing various simple aggregations. |
| |
| Generally speaking, in order to implement an application using Map/Reduce |
| model, the developer is to implement Map and Reduce functions (and possibly |
| combine function). However, a lot of applications related to counting and |
| statistics computing have very similar characteristics. Aggregate abstracts |
| out the general patterns of these functions and implementing those patterns. |
| In particular, the package provides generic mapper/redducer/combiner classes, |
| and a set of built-in value aggregators, and a generic utility class that |
| helps user create map/reduce jobs using the generic class. The built-in |
| aggregators include: |
| |
| sum over numeric values count the number of distinct values compute the |
| histogram of values compute the minimum, maximum, media,average, standard |
| deviation of numeric values |
| |
| The developer using Aggregate will need only to provide a plugin class |
| conforming to the following interface: |
| |
| public interface ValueAggregatorDescriptor { public ArrayList<Entry> |
| generateKeyValPairs(Object key, Object value); public void |
| configure(JobConfjob); } |
| |
| The package also provides a base class, ValueAggregatorBaseDescriptor, |
| implementing the above interface. The user can extend the base class and |
| implement generateKeyValPairs accordingly. |
| |
| The primary work of generateKeyValPairs is to emit one or more key/value |
| pairs based on the input key/value pair. The key in an output key/value pair |
| encode two pieces of information: aggregation type and aggregation id. The |
| value will be aggregated onto the aggregation id according the aggregation |
| type. |
| |
| This class offers a function to generate a map/reduce job using Aggregate |
| framework. The function takes the following parameters: input directory spec |
| input format (text or sequence file) output directory a file specifying the |
| user plugin class</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#ValueAggregatorJob--">ValueAggregatorJob</a></span>()</code> </td> |
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| <td class="colFirst"><code>static <a href="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#createValueAggregatorJob-java.lang.String:A-">createValueAggregatorJob</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] args)</code> |
| <div class="block">Create an Aggregate based map/reduce job.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#createValueAggregatorJob-java.lang.String:A-java.lang.Class-">createValueAggregatorJob</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] args, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><?> caller)</code> |
| <div class="block">Create an Aggregate based map/reduce job.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#createValueAggregatorJob-java.lang.String:A-java.lang.Class:A-">createValueAggregatorJob</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] args, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</a>>[] descriptors)</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#createValueAggregatorJob-java.lang.String:A-java.lang.Class:A-java.lang.Class-">createValueAggregatorJob</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] args, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</a>>[] descriptors, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><?> caller)</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../org/apache/hadoop/mapred/jobcontrol/JobControl.html" title="class in org.apache.hadoop.mapred.jobcontrol">JobControl</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#createValueAggregatorJobs-java.lang.String:A-">createValueAggregatorJobs</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] args)</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../org/apache/hadoop/mapred/jobcontrol/JobControl.html" title="class in org.apache.hadoop.mapred.jobcontrol">JobControl</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#createValueAggregatorJobs-java.lang.String:A-java.lang.Class:A-">createValueAggregatorJobs</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] args, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</a>>[] descriptors)</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#main-java.lang.String:A-">main</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] args)</code> |
| <div class="block">create and run an Aggregate based map/reduce job.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#setAggregatorDescriptors-org.apache.hadoop.mapred.JobConf-java.lang.Class:A-">setAggregatorDescriptors</a></span>(<a href="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> job, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</a>>[] descriptors)</code> </td> |
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| <h4>ValueAggregatorJob</h4> |
| <pre>public ValueAggregatorJob()</pre> |
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| <h4>createValueAggregatorJobs</h4> |
| <pre>public static <a href="../../../../../../org/apache/hadoop/mapred/jobcontrol/JobControl.html" title="class in org.apache.hadoop.mapred.jobcontrol">JobControl</a> createValueAggregatorJobs(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] args, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</a>>[] descriptors) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
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| <pre>public static <a href="../../../../../../org/apache/hadoop/mapred/jobcontrol/JobControl.html" title="class in org.apache.hadoop.mapred.jobcontrol">JobControl</a> createValueAggregatorJobs(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] args) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
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| <h4>createValueAggregatorJob</h4> |
| <pre>public static <a href="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> createValueAggregatorJob(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] args, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><?> caller) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">Create an Aggregate based map/reduce job.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>args</code> - the arguments used for job creation. Generic hadoop |
| arguments are accepted.</dd> |
| <dd><code>caller</code> - the the caller class.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a JobConf object ready for submission.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><code>GenericOptionsParser</code></dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>createValueAggregatorJob</h4> |
| <pre>public static <a href="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> createValueAggregatorJob(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] args) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">Create an Aggregate based map/reduce job.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>args</code> - the arguments used for job creation. Generic hadoop |
| arguments are accepted.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a JobConf object ready for submission.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><code>GenericOptionsParser</code></dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>createValueAggregatorJob</h4> |
| <pre>public static <a href="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> createValueAggregatorJob(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] args, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</a>>[] descriptors) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
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| <a name="setAggregatorDescriptors-org.apache.hadoop.mapred.JobConf-java.lang.Class:A-"> |
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| <h4>setAggregatorDescriptors</h4> |
| <pre>public static void setAggregatorDescriptors(<a href="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> job, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</a>>[] descriptors)</pre> |
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| <h4>createValueAggregatorJob</h4> |
| <pre>public static <a href="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> createValueAggregatorJob(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] args, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</a>>[] descriptors, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><?> caller) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
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| <pre>public static void main(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] args) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">create and run an Aggregate based map/reduce job.</div> |
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| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>args</code> - the arguments used for job creation</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
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